Patch-making machine



3 Sheets-Sheet l- E. DUGAW PATCH-MAKING MACHINE original Filed June 1, 193e Wmlw l l l HHH oct. 21, 1941.

Oct. 21, 1941. E. DUGAW PATCH-MAKING MACHINE Original Filed June l, 1936 3 Sheets-Sheet 2 Oct. 2l, 1941. E DUGAW 2,259,806

PATCH-MAKING MACHINE riginl Filed June 1, 195e 3 sheets-sheet 3 Wl'. l I

Patented Oct. 21, 1941 UNIT-Eo STATE S PATENT=OF1IFICE 1 APatron-MAKING MAcmNn Eugene Dugaw, Tacoma, Washj v Original application June 11, 51936,V Serlal- No.' 82,716, now Patent No. 2,168,766, dated August 8, 1939. Divided and this-.application August 7, 1939, Serial No. 288,88031:r 4

(c1. iii-2)' Y 6 Claims.

, patches by machinery, but the methods heretolore in usehave beentco slow, too inconvenient for practical use, too costly, or they have produced poor results, thus lowering the gradeV and salabillty o1" the manufactured product, and did not cut a patch with a beveled edge or a slivered tip suitable for use ,by either the hand Ypatcher or the sheet patcher.

it is an object of my invention to provide ymeans'whereby such a cutter may be mechanically operated; wherein the cutting force is applied to the vcutter -as described in Patent No. V2,163,706 adjacent the cutting edge, wherein such lorce is applied through a knuckle joint whereby the several knives are permitted to separate at their upper ends during the cuttingstroke.

It is a iurther object of my invention to mount the cutting tools on a head in such manner that the whole device may be slightly rotated onpits axis of motion, thereby permitting the operator to adjust the position of the knives in themachine as it is being operated so that the axis of the patch from point to point shall accurately lie parallel with the grain of the wood from which the patch is being cut. A further object of my invention is to provide aA feeding apparatuswhich is accurately adjustable, whereby the strip from which the patches are beingV cut is edthrough themachine at such a rate in relation to the Yoperatlon of the cutters, that the wastage o f wood in the strip may be reduced to a minimum.

I attain these and other objects by the devices and arrangements illustrated in the drawings led herewith. j

Fig. 1 isa sideelevation of the operating head of the complete machine, parts being shown in sectlon'to illustrate the construction of the mechanism for holding and driving the knives in the machine; Fig. 2 is a partial plan view thereof; Fig'. 3 is a-section on the line 3--3 in Fig. l; Fig. 4 is a plan view of one end ofA a patch cut by the knives; Fig. 5 is a front elevationvof the complete machine; Fig. 6 is a plan view thereof;

and Fig. 7 is an4 enlarged view 'of a part of the feed ratchet.

It is the .further object in my invention to use the knives illustrated'and described in my appli- -cation filed June 1 1936, Serial Number 82,716, @issued-Aug. 8,1939, as-Patent No. 2,168,766, in

conjunctiongwiththe herein described machine. Similar numerals of reference referto similar parts throughout the several views.

The Vmachine for cutting patches with the above-mentioned knives comprises a suitable frame 20 supporting a table 2l on which a suitable hopper 22 is formed, adapted to receive a `stack of previously cut strips 23 of veneer wood such as is used in making plywood, the said strips `23 being slightly wider than the length o f the patches l to be cut therefrom and having their grain running across the length of the strip so that the patches 'l are cuttherei'rom across the strip as it passes through the machine and therefore will have their grain parallel to the longitudinal axis of the patch. A motor 24 is mounted en the rear of the machine and drives an `overhead shaft 25 suitably supported from the frame'Ztl,Y The frontend of this shaft 25 is provided with a crank-disk 26, having an undercut radian slot 2'! therein, in which the crank-pin 28 may be adjustably mounted in any suitable vmanner in` relation tothe axisof the shaft 25.

.A connecting; rod 29 extends from the crankratchetwheel 3| to be4 spaced further apart, or

permitting a closer Aadjustment of the action of the ratchet apparatus. The ratchet wheel 3l is mounted on a shaft 36 on which the drum 3l is secured. vA second parallel drum 38 is mounted on the frame 20. A feed belt 39 is mounted on the two drums 3l and 38 and is driven by thevrotation of the drum 31 through the action of the ratchet mechanism. The feed belt 39 is provided with clips 4U adapted to engage and feed the lowest strip 23 from the stack of wood or veneer in the hopper 22V sothat, after each operation of the cutting mechanism, hereinafter de- ;scribed, the strip 23 is fed forward in the machine a certain definite predetermined amount, the extent of ksuch feed movement being con- ;trolledby' the adjustment of the crank-pin 28 tance by means of the above ratchet mechanism. 10. A connecting rod 42, operated by the said eccen` tric 4|, extends downward and is onnectedgby.;

a knuckle 43 to the hammer-head 44, This ham-g mer-head 44 is of general invertedU-shape; ex-l cept that its lower end islcircularin form'and l5 is provided with a circular..taiieii-3xtendirig outward therefrom. The knife .carrieris secured..

to the hammer-head 44 by means of the circular. ring with the ange 46 engaging the upper edge of the above-described flange 45 on the hammer` 20 head 44. Suitableballbearings 41 may .be .placed between the surfaces of the said flanges45 and .46 tcpermit easyrotationof .theknifecarrier inyrelation. to the hammer-,head 44,v in order to rotate 'theaxis yof.the.knives. carried thereby to a5 cause .them to cut a patch 1.with its major axis 4parallel to the.grainA of the strip 23 passing under the knivesV e.. ..1 n.

A vertically adjustable plate 48 is mounted on suitable vertical screws 49, mounted in the frame ,'30 20, and is guided by lugs 50.entering suitable L lgrooves 5|.-inthe .frame 26. .The turn-table .52 is supportedbytheplate. 48 -and.is axially -turnable thereon. Suitable ball bearings 53 are mounted between the ...plate-48 land the turn- 35,

table 52 to permitthe-turntable 52 to be readily turned on its vertical axis for the above described purpose. YThis turntable 52-carriesJ an `anvil-block 54 inits axial center, said? block being formed -of -end grain woodnsuitably se- ,uw

cured in place thereon and suitablybound by the-metal belt 55er other clamping means. 'I'he turntable 152 also carries-four vertical-posts 56 into which are screwed verticallguide rods 51 which extend up into the ring-58 which, in turn, 5 is mounted in a suitabley annular groove -59 -in 4the frame 20.'

Thev two cutter carriers-69 areY each mounted on two of saidguide rods51and move vertically vthereon under the action of thef driving mecha-5,U

nism. Thesev two knife carriers-166 are secured to opposite portions of the under side of Athe Vabove-described ring 46 and each is adapted to -carry one of the two--knives-I and 2 used in cutting the patch. f

Eachy knife carrieris provided with two upper ears or lugs- 6I and withtwo lower earsorlugs -62,'said ears 6l and 62 having suitableA holes -therein through which-the aboveguide rods 51 vpass vand by which the motion-of the said car- .60 -riersv'is vertically guided. A

Each knife carrier comprises a heavy Y-rec- -tangular metalA block and has an upper central cavity 63 in whichV4 the hereinafter described vend `of the knife'l.. or 2.

1a rectangular Hhorizontal transverse slot 65 adapted to receive thewkniie` block .66.`

`knife..block.66-and the. upper surface of the slot65 are provided with complementary lug .and .groove 61, .whereby the said. block..66\ is v`guidedto havea direct horizontal inward adjustment. The position .of .the said block .66 is 7.o

controlled by means of an adjusting screw 68 passing through the lower end of the carrier 66, the end of said screw 68 being provided with an inner head 69 lying in the vertical undercut groove 10 in the rear surface of the knife block 66 (Figs. 1 and 3)'. The adjusting screw 68 is preferably provided with a lock-nut 1I. A semicylindrical horizontal groove is provided in the Yri'nner'face of the block 66, ito'whichthe semicylindrical knife holder 12 rides and is free to Aturn in said groove and forms a hinge joint therewith. This knife holder 12 is provided with a vertical notch or depression made in its outer vface andmade with the same curvature as the outer face of the knife I or 2 (Fig. 3), said knife being; suitably rigidly secured to the knife holder v12 in the. said depression.

W .Thupper ends-of each knife I and 2 is provided with a round socket 13 secured thereto and 'adapted to enter the upper cavity 63 in the k.corresponding knife carrier 60 and to receive the Vend of a compression spring.14, whoseforce -is-controlled and adjusted by means of the adjusting screw 15, passing through the carrier Bil-and entering the said cavity 63. The screw 152 is provided witha lock-nut 1.6.

A pair of spring holding cushions 11 aresecured to .the under side of the plate.64. Thesev cushions .111engagethe strip 23 of.veneer from which the `patch is being cut, on each sideof the knives l and 2, and hold it downA on the block 54 when the knivesl and 2 are being withdrawn upward after cutting -out the .patchp -The said cushions 11 are, however, raised abovethe strip 23 when the knives Vare at the upper end of their stroke so that said strip may be readily fed forward-under the knives -the saidpredetermined distance while the knives are in'such elevated position that the said cushions do not engage the strip 23.

It will be of course understoodthat the posi- -tions of the crank 28 and the eccentric Y4l von the vdrive shaft 2'5 are lsuch, relatively to each other, that -the entire extent 'of the feed motion is accomplished Vduring the-time that the knives are raised and sothat the feed is motionless during the time that the cushions 11-and the knives I and -2 are in contact with-'thestrip 423.

It will also be understood that the patch cut fromthestrip bythe downward motion-of the knives I and 2 stays between themand is'pushed -upward by the successive patches'being cut from thestrips as theyY pass. The patches have their 'slivers Il) cutv soon after theyv travel upward in -thespace between the knives, by means of the Vsharpened edges Il of the notches 9. Since the space l6 increases in size towardsthe top of the knivesthe patches travel upward therein easily.

-YThus it Ywill be seenthat-the .tool for cutting outlthe patch from the strip, comprises two simi- Alar curvedknives which spring apart when hit with'a hammer, when usedas a hand tool, therelby cutting the patch with beveled edges, and when mountedin the machine, havinga substan- -tially"similar movement when actuatedby the machine. -Also that/the machine feeds thestrip of veneer, from which the patches are being cut, at suchan adjusted rateas to waste aslittie. ofthe wood asy possible. Also that the knives may be 'adjusted4 about vthe vertical axis While .the .ma- 4chine is in full. operation so that the grainof the ipatc-h will .always .extend from point. to point thereof,. even if the grain in the stripdoes not lie exactly transversev thereof for a portion of the `lengthf the strip.A Also the machine applies the :cutting forcethrough a hinged joint at a point near the cutting edges of the knives, thus permitting them to spring apart at their upper ends against the action of the spring braces, thus approximating the effect of holding the knives by hand.

It is of course understood that many variations may be made in the details of construction of the above described machine, without departing from the spirit of my invention as outlined in the claims.

Having, therefore, described my invention what I claim and desire to secure by Letters Patent, is:

l. In a machine for cutting patches, the combination with a frame; of a vertically reciprocating hammer-head; a knife-carrier mounted on said hammer-head and rotatable thereon about a vertical axis; means for guiding said knifecarrier; a pair of complementary knives mounted on said knife-carrier and extending downward therefrom; and means for rotatably supporting said guiding means, whereby the said knife-carrier may be rotated to adjust the longitudinal axis of the patch.

2. In a machine for cutting patches, the combination with a frame; of a vertically reciprocating hammer-head; a knife-carrier mounted on said hammer-head and rotatable thereon about a vertical axis; means for guiding said knifecarrier; a pair of complementary knives mounted on said knife carrier and extending downward therefrom; means for rotatably supporting said guiding means, whereby the said knife-carrier may be rotated to adjust the longitudinal axis of the patch; and an anvil block mounted on said rotatable supporting means and turning therewith and adapted to support the strip of veneer from which the patch is being out.

3. In a machine for cutting patches as set forth in claim l, wherein the connection between said hammer-head and said knife-carrier comprises an extended flat surface adapted to transmit the force of the hammer-head to the knife-carrier;

a ring flange extending from said hammer-head; and an annular flange extending from said knifecarrier and engaging the upper surface of said ring flange.

4. In a machine for cutting patches, the combination with a frame; of a vertically reciprocating hammer-head; a flanged ring rotatably mounted on said hammer-head; two knife-carriers secured to opposite points of the under side of said ring and having their upper Surfaces in contact with the under surface of said hammerhead; a pair of complementary knives resiliently mounted on said knife-carriers in contact with each other; and means for guiding said knifecarriers.

5. A machine for cutting patches as set forth in claim 4, wherein the resilient mounting of each of the knives comprises a block mounted on the lower portion of the knife carrier; a horizontal semicylindrical groove therein; a knife holder mounted in said groove and secured to the lower portion of said knife, whereby the lower` end of the knife is rigidly held against relative vertical motion on the carrier but is permitted a swinging motion thereon; and a spring brace mounted between the upper portion of the knife and the knife carrier and resiliently holding the knife in contact with the complementary knife.

6. A machine for cutting patches as set forth in claim 4, wherein the resilient mounting of each o-f the knives comprises a block laterally slidably mounted on the lower portion of the knife carrier; means in said knife carrier adapted to adjust said block laterally; a horizontal semicylindrical groove in said block; a knife holder in said groove and secured to the lower portion of said knife; a spring brace mounted between the upper portion of said knife and the knife carrier, and resiliently holding the knife in contact with the complementary knife; and means for adjusting the pressure of said spring brace.

EUGENE DUGAW. 

